Korngränskorrosionsbeständigt austenitiskt Rostfritt stål och dess Method for productions

摘要

The invention relates to an austenitic stainless steel having high resistance to intergranular corrosion. For good intergranular corrosion resistance the stainless steel thermomechanically processed having the fraction of special coincidence site lattice grain boundaries in the microstructure of the stainless steel at least 60%, preferably at least 80%, contains 0.03 - 0.5 % C, 0.01 - 3 % Si, 0.01 - 20 % Mn, 10-30 % Cr, 0.01 - 8 % Ni, 0.01 - 3 % Mo, 0.01 - 3 % Cu, 0.03 - 0.5 % N, 0.001 - 0.5 % Nb, 0.001 - 0.5 % Ti, 0.001 - 0.5 % V, the balance of Fe and inevitable impurities,, in which austenitic stainless steel carbon is utilised as an austenite forming element and an austenite stabilising element and a solid solution strengthening element. The invention also relates a method for producing the austenitic stainless steel in which method thermomechanical processing consists of at least one plastic deformation stage and at least one subsequent heat treatment stage.